<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <div id="example">
        <p>Original message:"{{message}}"</p>
        <p>Computed reversed message:{{reverseMessage}}</p>
    </div>
</body>
<script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
<script>
    var vm = new Vue({
        el: '#example',
        data: {
            message: 'Hello'
        },
        computed:{
            //计算属性的getter
            reverseMessage: function(){
                //this指向vm实例
                return this.message.split('').reverse().join('')
            }
        }
    })
</script>
</html>